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Question

Expanded octet occurs in:
  1. NH3
  2. PF5
  3. H2O
  4. O2

A
NH3
B
H2O
C
O2
D
PF5
Solution
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Expanded octet means having more than 8 electrons in the outermost shell. In PF5, the phosphorus atom contains 10 electrons in its outermost shell. Thus expanded octet occur in PF5.
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